proc: unlock console on exit if locked by the dying process

kernel-src/include/kernel/proc.h

@@ -47,6 +47,7 @@ typedef struct proc_t {
 	struct fd_t *fd;
 	mode_t umask;
 	int flags;
+	bool console_locked;
 	vnode_t *cwd;
 	vnode_t *root;
 	spinlock_t nodeslock;

kernel-src/sys/proc.c

@@ -9,6 +9,7 @@
 #include <kernel/elf.h>
 #include <kernel/devfs.h>
 #include <kernel/kernel_args.h>
+#include <kernel/console.h>
 
 static hashtable_t pid_table;
 static scache_t *processcache;
@@ -296,6 +297,10 @@ void proc_exit(void) {
 	itimer_pause(&proc->timer.virtualtime, NULL, NULL);
 	itimer_pause(&proc->timer.profiling, NULL, NULL);
 
+	if (__atomic_load_n(&proc->console_locked, __ATOMIC_RELAXED)) {
+		__assert(console_set_lock(false) == 0);
+	}
+
 	// zombify the proc
 	MUTEX_ACQUIRE(&proc->mutex);